Reacting to a demand for uniform spectrum usage charge by GSM operators, Reliance Jio Infocomm has opposed any change in rates for the use of radiowaves by mobile operators.

"Unilateral increase in SUC for BWA spectrum from 1 per cent to 3 per cent will be illegal... Government may take appropriate decision on SUC for forthcoming auctions but without altering the present SUC regime, either directly or indirectly, for already allocated/auctioned spectrum," Mukesh Ambani-led RJIL said in the letter to Telecom Secretary.

Levied annually by the government as a percentage of revenue earned by mobile operators from telecom services, SUC varies from 3-8 per cent.

The uniform SUC, if implemented as per recommendations made by Telecom Regulatory Authority of India, will provide relief for mobile operators such as Airtel, Vodafone and Idea, but will increase rates for broadband wireless access (BWA) spectrum holders like RJIL.

The Reliance Jio letter comes a day before the scheduled meeting of inter-ministerial panel Telecom Commission which will look at possible approach towards SUC and send its recommendations to Empowered Group of Ministers on telecom, headed by Finance Minister P Chidambaram.

The company said the terms and conditions of Notice Inviting Application, main document of spectrum auctions, are equally binding on both DoT and bidders and "any post facto deviation in auction rules which extends undue benefit to incumbent operators will not stand judicial scrutiny".

RJIL said that companies, while buying spectrum in the auction factored in conditions including SUC in their bid amounts with reasonable expectation that the conditions notified will not be altered.

The company added that at lower uniform SUC for spectrum that had been auctioned in past, there would have been more participation and bids more aggressive.

"Therefore, retrospective reduction in the SUC would not only cause huge loss to the government but also would have deprived some of the operators to acquire spectrum through these auctions," RJIL said.

DoT estimates that lowering of SUC as per Trai recommendations will cause the national exchequer a minimum loss of Rs 3,738 crore over period of 20 years on renewal of the six licences belonging to Airtel, Vodafone and Loop Mobile that are due to expire in 2014.

RJIL referred to the submission made by GSM industry body, Cellular Operators Association of India, Assocham and top executives of leading GSM mobile operators and said the representations do not necessarily put forward the correct facts and might mislead the government.